If a person is wondering if they are allergic to food, they need to first look at their family history. More than likely, if a person's parents have allergies, the individual will experience some form of allergic reaction. Allergies and other things are hereditary and can cause an individual to have to alter their life in order to deal with the allergy. Another way that people can develop an allergic reaction to food is in the early years of infancy and toddler hood. If a person is allergic to food, then this may be the prime time when the allergy will rear its ugly head.